Milling machine



FIG. 1 is a front perspective view-of a milling machine showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a front perspective view thereof with the right cover in an open position; and

FIG. 7 is a front perspective view thereof with the left cover in an open position.

The broken lines in the drawings depict unclaimed environmental subject matter. 

The ornamental design for a milling machine, as shown and described. 